Reproductive and seminal characteristics of Pelibuey rams infected with Mycobacterium avium subsp. paratuberculosis in the subclinical stage

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J. Vicente Vel´ázquez-Morales https://orcid.org/0000-0003-2576-670X
Marco A. Santillán-Flores https://orcid.org/0000-0001-7423-8642
Ma. Carmen Navarro-Maldonado https://orcid.org/0000-0002-7858-7038
Juan Salazar-Ortiz https://orcid.org/0000-0002-0435-8160
Demetrio A. Ambriz-García https://orcid.org/0000-0002-1305-5487
Jorge Palacio-Núñez https://orcid.org/0000-0002-8374-8801
José L. Ponce-Covarrubias https://orcid.org/0000-0002-0182-6846
César Cortez-Romero https://orcid.org/0000-0001-7213-9034

Keywords

Subclinical paratuberculosis, live weight, seminal evaluation, rams.

Resumen

Objective: To evaluate the reproductive and seminal characteristics of Pelibuey rams infected with Mycobacterium avium subsp. paratuberculosis in the subclinical phase.


Design/methodology/approach: In order to determine whether paratuberculosis (PTB) affects the reproductive variables and seminal quality in Pelibuey rams naturally infected with Mycobacterium avium subsp. paratuberculosis (MAP) in the subclinical phase, weekly evaluations were conducted, over a period of two months, of the variables live weight, scrotal circumference, ejaculation latency and seminal characteristics: volume, pH, masal motility and progressive individual motility, concentration, live spermatozoids and dead spermatozoids, in five rams infected by MAP and a further five uninfected rams, of average weight and age 53.58 kg (± 3.26) and 2.91 years (± 0.59), respectively.


Results: PTB was not found to affect the reproductive and seminal variables evaluated.


Limitations of the study/implications: It would have been convenient to carry out the evaluation of the seminal characteristics for a longer time, however, the sampling was stopped in order to ensure the animal welfare of the rams as far as possible, since they began to show signs of PTB.


Findings/Conclusions: The Pelibuey rams diagnosed with PTB in subclinical phase did not present any effect on the reproductive and seminal characteristics. Meanwhile, reproductive management can be carried out with PTB-infected Pelibuey lambs in a subclinical phase.

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